VR Eyeball Tracking Light Source Interference
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Solution Overview
Problem
In virtual reality systems, the interference between light sources from two eyeball tracking modules leads to increased calculation errors and reduced position accuracy, especially for users wearing myopia glasses, due to the integrated nature of these devices.
Innovation Solution
A method and system where only one infrared light source is turned on in each frame, with a left tracking camera capturing reflected light for one eye and a right tracking camera capturing reflected light for the other eye, using the binocular pupillary distance to calculate tracking data and arrange it in a time sequence to form binocular tracking data, thereby avoiding mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two eyeball tracking modules are respectively provided on left and right eye positions with the same light source, then the device structure is complete for binocular tracking, but light rays emitted by the light sources interfere with each other causing calculation errors and reduced position accuracy
Solution Approach 1:
The patent implements periodic action by alternately activating left and right infrared light sources in different time frames. In odd frames, the left light source is activated while the right is off; in even frames, the right light source is activated while the left is off. This temporal separation eliminates light source interference while maintaining continuous binocular tracking capability through alternating capture cycles.
Solution Approach 2:
The patent applies dynamics by making the light source activation state changeable over time rather than static. The system dynamically switches between different light source configurations (left-only, right-only) based on the frame number parity, allowing the tracking system to adapt its illumination pattern to eliminate interference while preserving tracking functionality.
2Device complexity
If the same light source is used in both eyeball tracking modules, then the device complexity is reduced, but calculation result errors increase especially for users wearing myopia glasses
Solution Approach 1:
The patent uses periodic action to alternate between using the left light source and right light source in different time frames. This temporal multiplexing allows the system to use a shared light source configuration (reducing device complexity) while eliminating simultaneous light interference (improving measurement precision) by ensuring only one light source is active at any given frame.
Solution Approach 2:
The patent applies segmentation by dividing the binocular tracking process into separate time segments (odd frames for left eye, even frames for right eye). This temporal segmentation allows the use of a simplified light source configuration while maintaining high measurement precision by processing each eye's data in dedicated time slots without cross-interference.
3Productivity
If both infrared light sources are turned on simultaneously, then the tracking process is continuous and efficient, but mutual interference between light sources increases calculation errors
Solution Approach 1:
The patent implements periodic action by alternating the activation of left and right infrared light sources across successive frames. This creates an efficient tracking process where data capture continues without interruption (maintaining productivity) while eliminating simultaneous light source interference (preserving measurement precision) through time-division multiplexing.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that while one light source is off, the other is on, so that data capture for binocular tracking continues without interruption. The alternating pattern ensures continuous tracking efficiency while avoiding the harmful effect of simultaneous light source activation, as each frame still receives appropriate illumination for its designated eye.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach eliminates light source interference, reducing calculation errors and improving the accuracy of eyeball tracking in virtual reality systems.
Implementation Method 1
capturing reflected infrared light of a turned on left infrared light source through a left tracking camera and capturing reflected infrared light of a turned on right infrared light source through a right tracking camera
Data Source
AI summary
A virtual reality-based eyeball tracking method and system are provided. Eyeball calibration data is presented to eyes of a user through a display, and then a binocular pupillary distance of the user is obtained through the eyeball calibration data. A left tracking camera captures reflected infrared light of a turned on left infrared light source, and a right tracking camera captures reflected infrared light of a turned on right infrared light source, so that tracking data of one eye is formed in each specific frame. Tracking data of the other eye in the specific frame is calculated according to the binocular pupillary distance and the tracking data of one eye. The tracking data of one eye and the tracking data of the other eye are arranged according to a time sequence of the specific frame to form binocular tracking data so as to complete eyeball tracking.